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Quasielastic neutron scattering study of hydrogen motion in NbC(0.71)H(0.28)
A V Skripov1, T J Udovic, J C Cook
1Institute of Metal Physics, Ural Division of the Russian Academy of Sciences, Ekaterinburg 620041, Russia.
Abstract:
In order to study the mechanism and parameters of H jump motion in the nonstoichiometric Nb carbides, we have performed quasielastic neutron scattering (QENS) measurements for NbC(0.71)H(0.28) over the temperature range 11- 475 K. Our results indicate that about 30% of H atoms in this system participate in a fast diffusive motion. The temperature dependence of the corresponding H jump rate in the range 298-475 K follows the Arrhenius law with an activation energy of 328 ± 9 meV. The Q dependence of the QENS data suggests that the observed jump motion corresponds to long-range diffusion of H atoms along chains of the off-centre sites in carbon vacancies.
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